EP1539323B1 - Settling device - Google Patents

Settling device Download PDF

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Publication number
EP1539323B1
EP1539323B1 EP03788206A EP03788206A EP1539323B1 EP 1539323 B1 EP1539323 B1 EP 1539323B1 EP 03788206 A EP03788206 A EP 03788206A EP 03788206 A EP03788206 A EP 03788206A EP 1539323 B1 EP1539323 B1 EP 1539323B1
Authority
EP
European Patent Office
Prior art keywords
liquid
settling
settling device
panels
previous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03788206A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1539323A1 (en
Inventor
Hans Larsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordic Water Products AB
Original Assignee
Nordic Water Products AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nordic Water Products AB filed Critical Nordic Water Products AB
Publication of EP1539323A1 publication Critical patent/EP1539323A1/en
Application granted granted Critical
Publication of EP1539323B1 publication Critical patent/EP1539323B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
    • B01D21/0036—Horizontal partition walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0006—Settling tanks provided with means for cleaning and maintenance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0045—Plurality of essentially parallel plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2433—Discharge mechanisms for floating particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2444—Discharge mechanisms for the classified liquid

Definitions

  • This invention concerns a settling device according to the preamble of claim 1.
  • Inclined plates are commonly used in settling devices for settling tanks to increase settling area and thereby capacity to clarify liquid.
  • the liquid, most often water, to be treated is distributed, together with its contents of undesired suspended solids, from an influent channel to liquid lamellas which are formed between the inclined plates. It flows upwardly during settling of the suspended solid particles and subsequently reaches an overflow for clarified liquid.
  • the increase in capacity of settling tanks with inclined plates is due to the fact that the particles only have to move the short vertical distance to the lower plate in the liquid lamella in order to be separated.
  • the particles When the particles have reached the inclined plates they will slide down along the plates into a sludge holding volume which is positioned below the inclined plates. From there sludge is normally transported by a scraper or by gravity to a sludge hopper which it leaves as an underflow.
  • Type a. devices are normally built and assembled in a workshop and shipped to the point of use, whereas the effluent flume/feed channel combination of the b. type settling device is built and assembled in a workshop and shipped to the point of use where it is mounted inside a concrete tank by bolting it to anchoring pieces in the concrete walls. The plates are then mounted inside the tank one by one at site.
  • Inclined plate settling devices have basically been built in the same way for more than 20 years. Because of the complexity of making and installing prior art settling devices, there is a great need and demand for a simpler, more cost-effective inclined plate settling device.
  • the device according to the invention is preferably constructed as a pack to be placed in a tank or in a volume of liquid or used as a free-standing unit. In the latter case the device is completed so as to form a tank unit by its own.
  • Each such pack consists preferably of an inclined box having a parallelepiped shape with sidewalls and end walls, but no top and bottom walls, in which the plates are placed on internal supports.
  • the parallelepiped box When the device is made operational, the parallelepiped box is placed in a tank or a volume of liquid so that its upper end sticks out of the liquid.
  • Each side wall is arranged so that it will end at or below a lowest possible liquid level during operation of the settling tank or the volume of liquid.
  • a top portion defining a top plate or a weir is arranged at the side wall side with its upper part either positioned such that the inclined settling plates are totally submerged or defining a weir adapted at the desired level for allowing clarified liquid to run over it at a level below the top of the settling plates.
  • type a., clarified liquid would suitably fall into one or more effluent flumes positioned at a level above the inclined plates.
  • a perforated plate can be placed on top of the settling plates and the effluent leaves over a side weir into an effluent flume.
  • Each top portion defining a top plate or a weir is positioned in a sealed relationship against the side wall, either sealing directly or indirectly.
  • clarified liquid would suitably fall into one or more effluent flumes which would be provided fastened at the outside of the plane of the side wall(-s).
  • each weir which can be provided on one side wall of the corresponding effluent flume is a part of the flume.
  • the flumes and/or the weirs are suitably functioning as reinforcement of the box-structure of the parallelepiped box.
  • the weir can be provided with a saw-tooth shaped v-notch or other notch arrangement along its top for controlling the overflow of the clarified liquid. This makes adjustment of draw-off of clarified liquid easier. If one notch is provided for each liquid lamella it can be established that clarified liquid is drawn off from each liquid lamella and that there is no obstruction in the passage.
  • effluent flume(s) can be placed above the plates.
  • the flow into the flumes, and thereby the distribution and flow of water between the liquid lamellas can be controlled either by throttling holes below the liquid level or by overflow weirs.
  • overflow weirs may be fitted with the above mentioned notch arrangements.
  • a combination of effluent flumes above the plates and a side-mounted effluent flume into which the top flumes discharges can also be used.
  • Fig. 1a shows in general a settling device 1 having the general box-like structure shape such as that of a parallelepiped box with side walls, one indicated with 2, and end walls, one indicated with 3.
  • the side walls 2 and end walls 3 include reinforcement means 4 so as to define the box shape.
  • the side walls are preferably bolted or welded to the end walls at assembly to form a box.
  • a number of inclined panels or settling plates 5 are positioned so as to define between them a corresponding number of liquid lamellas when the device is in operation.
  • the side walls terminate at a position below a region defining a low level of the liquid inside the box.
  • a top portion at the top of each side wall side such that the purified liquid level can be set as desired.
  • a strip shaped weir 7, 7' At the top there is thus positioned on each side, outside the side walls, a strip shaped weir 7, 7', having an upward directed saw-tooth shape with a number of upwardly directed v-notches.
  • clarified liquid having passed the inclined settling plates will run over the weirs 7, 7' and fall into an effluent flume 6, 6' being positioned outside each weir 7, 7'.
  • the effluent flumes are used for discharging the clarified liquid from the settling device.
  • the settling device 1 is open upwardly and the positions of the weirs are such that the embodiment shown is a b. type settling device, that is having the inclined settling plates sticking out above the liquid level.
  • the parallelepiped box is open downwardly (not shown) in order to allow settled solids that slide downwardly along the settling plates to fall down into a sludge compartment of the tank or the liquid volume where the settling device 1 is intended to be positioned.
  • Below the side wall 2 there is an open area allowing liquid to be treated to flow into the liquid lamellas between the respective inclined settling plates 5.
  • Inlet ports 8 are defined for each liquid lamella by the respective inclined plates in said open area. Inlet ports 8 are preferably arranged also at the other side of the settling device 1 (not shown).
  • the inclined settling plates at their sides which are directed at the inlet area, as defined by the plurality of inlet ports 8, can be provided with bent rim portions directed upwardly in order to reduce the impact of inflowing liquid through the inlet ports 8 on already settled material on the inclined settling plates.
  • Fig. 1b shows in greater detail an upper portion of the settling device with the weir with a vertical oblong hole 9 for allowing adjustment of the weir.
  • weir 7, 7' is mounted together with the respective effluent flumes 6, 6' in order to simplify assembly at the site of use. It should also be noted that the effluent flumes 6, 6' function as stabilisers for the upper portions of the side walls 2. According to one modification the weir is an integral part of the corresponding effluent flume.
  • FIG. 2a A second embodiment is shown in Fig. 2a , where a settling device 11 having walls 12, 13, reinforcement means 14, inlet ports 18 and effluent flumes 16, 16' is shown.
  • a cover plate 15 for distribution of the flow evenly through the settling device, and having holes for allowing passage of clarified liquid.
  • weirs 17, 17' are positioned with the top at a level above the cover plate such that the settling device 11 will be a representative of the type a. settling device as defined above.
  • Fig. 2b an upper portion of the settling device 11 is shown in more detail, wherein more clearly the effluent flume 16' is shown having an open channel-shape and a weir defined by a straight edge of a plate 17'.
  • the cover plate 15 is shown with through-holes 19 for clarified liquid.
  • FIG. 3a A third embodiment is shown in Fig. 3a where a settling device 21 having walls 22, 23, reinforcement means 24, effluent flumes 26, 26' and inclined settling plates 25 is shown.
  • Weirs 27, 27' are in this case provided with holes 29 at regular intervals along the extension such that in operation it is possible to monitor the operation by studying liquid outflow through these holes in order to discover if there has become any obstructions in a lamella between two or more of the inclined settling plates 25.
  • a portion of the settling device 21 is shown in more detail, with the holes 29 along the extension of the weir plate 27'.
  • FIG. 4a and b it is shown how an inclined settling plate 5 is supported in the settling device.
  • a support rail 30, constituting a support element, and with an L-shaped cross-section is fixed on the inside of each side wall (one indicated with 2). It should be understood that for each plate 5 there is one support rail 30 on each side.
  • a clip portion 31 which can be cut out from the plate material of the settling plate 5 and bent twice so as to form a clip-shaped holder, which co-operates with the upper edge of the support rail 30.
  • Each support rail 30 can have L-shaped cross section whereby one shank of the L-shape is vertical so as to provide an upwardly bent portion also in an inlet area of the settling device. This way interference is avoided from incoming water to be treated with already settled solids on the settling plates. See discussion about the rim portions in connection with fig 1a .
  • a settling device 41 is provided with central, profile shaped support pieces 48, which are arranged between two portions 45, 45', together making up a settling plate plane.
  • 46, 46' indicate effluent flumes, 47, 47' indicate weirs.
  • the panel portions are supported, e.g. by support rails (not shown).
  • Each central support piece 48 includes an engagement portion 49, a distance portion 52 and a contacting portion 51.
  • the engagement portion 49 has engagement slots 50, 50' for receiving inner edges of settling panel portions 45, 45' from each side. These slots 50, 50' include grip edges for obtaining good friction contact and safe engagement between each support piece and the corresponding panel portions.
  • the distance portion 52 consists of a strip-shaped member 52, and the contacting portion 51 rests on a neighbouring central support piece 48'.
  • the purpose of the construction with central support pieces is to allow the construction of a relatively wide settling device 41 without risking that the settling panels bend by their own weight and by the weight of settled solids, which could result in one or more settling panels bending downwardly and thereby falling off their supports.
  • central support pieces are elongated, strip-shaped and that they are shown in cross section in Figs. 5a and b. This means that inflow of the liquid to be treated must be provided at each side wall side of the settling device 41 and/or the support pieces can be perforated.
  • Fig 6 an arrangement 52 is shown for cleaning the inclined panels or plates 5 of two settling devices 1 which are arranged side by side with a certain distance from each other.
  • the upper outer edges of the effluent flumes 6 of the two settling devices are constructed as rails 53 for a rail-mounted liquid jet device 54 having wheels 55.
  • This device is connected to a pressure liquid source 56 and is equipped with rigid tubes 58 having nozzles 57 at their ends.
  • the device 54 is controlled in some way, either as a robot or simply by manual control, in order to successively clean the inclined panels 5 from settled out material that will not slide down by gravity forces. It is to be understood that the device 54 can be constructed otherwise, e.g. so as to serve one single settling device 1.
  • the invention could be modified further and one modification is that in a type a. arrangement there are arranged effluent flumes directly above the settling plate in a per se known manner.
  • the top portions may be configured in various ways and at various levels according to what is desired in the particular case. Further the top portion may provide a weir or simply a wall, in which case purified water leaves the device over a weir positioned in any other way.

Landscapes

  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Removal Of Floating Material (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Bipolar Transistors (AREA)
  • Sewage (AREA)
  • Eye Examination Apparatus (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Treatment Of Sludge (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Activated Sludge Processes (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP03788206A 2002-08-14 2003-08-13 Settling device Expired - Lifetime EP1539323B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0202420A SE524049C2 (sv) 2002-08-14 2002-08-14 Sedimenteringsanordning
SE0202420 2002-08-14
PCT/SE2003/001269 WO2004016337A1 (en) 2002-08-14 2003-08-13 Settling device

Publications (2)

Publication Number Publication Date
EP1539323A1 EP1539323A1 (en) 2005-06-15
EP1539323B1 true EP1539323B1 (en) 2009-10-14

Family

ID=20288715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03788206A Expired - Lifetime EP1539323B1 (en) 2002-08-14 2003-08-13 Settling device

Country Status (13)

Country Link
US (1) US6899231B2 (sv)
EP (1) EP1539323B1 (sv)
CN (1) CN1313185C (sv)
AT (1) ATE445449T1 (sv)
AU (1) AU2003251269A1 (sv)
BR (1) BR0313390B1 (sv)
CA (1) CA2495381C (sv)
DE (1) DE60329690D1 (sv)
ES (1) ES2334996T3 (sv)
PL (1) PL205831B1 (sv)
RU (1) RU2290980C2 (sv)
SE (1) SE524049C2 (sv)
WO (1) WO2004016337A1 (sv)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7213712B2 (en) * 2005-02-04 2007-05-08 Rg Delaware, Inc. System for settling solids or other impurities from water or wastewater and associated methods
US7763166B2 (en) * 2006-06-16 2010-07-27 Canadian Oil Sands Limited Relocatable countercurrent decantation system
KR100712962B1 (ko) 2007-01-26 2007-05-02 뮤러아시아(주) 경사판 침전설비
US20080314823A1 (en) * 2007-06-20 2008-12-25 Kulick Iii Frank M Extruded lamella separator panel modules
US20090277315A1 (en) * 2008-05-08 2009-11-12 Alek Ipatenco Tile saw
KR100872767B1 (ko) 2008-07-02 2008-12-08 뮤러아시아(주) 침전조의 조립식 경사판 침전장치
KR100888713B1 (ko) 2008-09-25 2009-03-17 동양수기산업(주) 손실수두제어 유량분배형 상향류식 경사판 침전장치
US7850860B2 (en) * 2009-03-25 2010-12-14 Jim Myers & Sons, Inc. Plate settler with angular support members
US20110127198A1 (en) * 2009-11-03 2011-06-02 Syncrude Canada Ltd. In Trust For The Owners Of The Syncrude Project Oil sand slurry solids reduction to enhance extraction performance for problem ores
US8317036B2 (en) 2010-05-11 2012-11-27 Roberts Marketing De, Inc. Apparatus and method for removing impurities from water or wastewater
US8585896B2 (en) 2011-06-10 2013-11-19 Roberts Marketing De, Inc. Apparatus and method for removing impurities from water of wastewater
US9149741B2 (en) * 2012-09-24 2015-10-06 Unipure Corporation Mobile fluid treatment system and associated apparatus
US10724314B1 (en) 2013-03-15 2020-07-28 Rio Resources Llc Method and apparatus for collection, treatment, and recycling of oilfield drilling fluids and wastewater
SE538116C2 (sv) * 2014-04-30 2016-03-08 Nordic Water Prod Ab Lamellavskiljare
CN105879435B (zh) * 2014-10-20 2019-01-22 丁美华 斜板沉淀池的板间自动清淤系统
ES2743348T3 (es) 2015-06-20 2020-02-18 Pacific Petroleum Recovery Alaska Llc Separador de aceite-agua
US11260322B1 (en) 2019-04-08 2022-03-01 Jim Myers & Sons, Inc. Plate assembly and method of manufacturing for use in water treatment
CN110608976B (zh) * 2019-10-19 2022-05-10 杭州鼎昇建材有限公司 一种用于检测混凝土外加剂适应性的装置
US11001518B1 (en) 2020-02-12 2021-05-11 Rio Resources Llc Methods for treatment and purification of oil and gas produced water
CN113860551B (zh) * 2021-10-07 2023-08-11 生态环境部南京环境科学研究所 一种村镇垃圾中转站渗滤液氮磷回收系统

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US3886064A (en) * 1971-11-12 1975-05-27 Gustavsbergs Fabriker Ab Lamellar separator

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Publication number Priority date Publication date Assignee Title
GB925993A (en) * 1959-01-19 1963-05-15 Kloeckner Humboldt Deutz Ag A clarifying apparatus for liquids which contain finely divided solids
US3886064A (en) * 1971-11-12 1975-05-27 Gustavsbergs Fabriker Ab Lamellar separator

Also Published As

Publication number Publication date
BR0313390A (pt) 2005-07-05
RU2005106859A (ru) 2005-08-10
US20040031750A1 (en) 2004-02-19
BR0313390B1 (pt) 2011-08-23
CN1674969A (zh) 2005-09-28
US6899231B2 (en) 2005-05-31
CA2495381C (en) 2011-09-27
SE524049C2 (sv) 2004-06-22
PL205831B1 (pl) 2010-05-31
CA2495381A1 (en) 2004-02-26
WO2004016337A1 (en) 2004-02-26
ES2334996T3 (es) 2010-03-18
CN1313185C (zh) 2007-05-02
SE0202420D0 (sv) 2002-08-14
AU2003251269A1 (en) 2004-03-03
ATE445449T1 (de) 2009-10-15
PL373666A1 (en) 2005-09-05
EP1539323A1 (en) 2005-06-15
SE0202420L (sv) 2004-02-15
RU2290980C2 (ru) 2007-01-10
DE60329690D1 (de) 2009-11-26

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